<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>


</head>

<body>
    <script src="./hello.js"></script>
    <!-- <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.7.1/jquery.js"></script> -->


    // // 1. 变量声明

    // var str = "Hello, World!";
    // var isTrue = true;
    // var arr = [1, 2, 3, 4, 5];
    // var obj = {
    // name: "Alice",
    // age: 25
    // };
    // var $hello = "Hello, World!";
    // var _world = "World";
    // var num1 = 5, num2 = 10, num3 = 15;

    // console.log(num)
    // var num = 100; //变量提升
    // console.log(num); // 100



</body>

</html>